JP3585250B2 - Method and apparatus for bending a long material having a hollow portion - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method and an apparatus for bending a long material having a predetermined hollow cross section.
[0002]
[Prior art]
When a long frame material 50 is bent to form an automobile door frame, the apparatus shown in FIG. 5 is conventionally used.
First, one end of the elongated material 50 is gripped by the chuck 61, and the other end is gripped by the chuck 62 at the tip of the rod 63 a of the air cylinder 63. Next, the elongate material 50 is pressed against the mold surface of the mold 65 while the elongate material 50 is tensioned by the air cylinder 63. Thus, the long material 50 is bent into a shape along the mold surface of the mold 65.
[0003]
Here, the long material 50 is a long metal plate cut to the length of the door frame to be prepared, and is rolled into a cross-sectional shape (see FIG. 4) of the door frame. (By transporting in the longitudinal direction through a number of roller pairs whose pressing surface shape is gradually changed in the arrangement order, the cross section, which was initially flat, is finally changed to the cross section of the door frame. ), And the same applies hereinafter. The mold 65 is prepared according to the shape of the door frame to be created.
[0004]
[Problems to be solved by the invention]
In the conventional method, a mold must be prepared according to the shape of the door frame to be produced. In other words, different dies must be prepared for each type of door frame. For this reason, not only is it disadvantageous in terms of cost, but also a large area is required for installation of each mold. Further, there is a disadvantage that when the model is changed, the old mold must be discarded and a new mold must be prepared.
[0005]
Further, as described above, since both ends of the long material 50 are gripped and pulled by the chucks 61 and 62, the gripped portion is deformed. Therefore, the part cannot be used as a product and is discarded as scrap material. Therefore, the yield is reduced.
In addition, since the long material 50 is bent by being pressed against the mold 65 while being tensioned, the width of the bent portion 50a is reduced as shown in FIG. It is thinner than the width of the non-part 50b. Also, the degree is not uniform, and differs depending on the degree of bending. For this reason, not only the appearance is poor, but also there is a difficulty that the machining of the member on the vehicle body side corresponding to the relevant portion has to be performed in consideration of the above-described slenderness.
[0006]
The present invention reduces the cost by eliminating the need for a mold, reduces the area for installing the apparatus, and provides a bending method and a bending method capable of making the width of the door frame of the final product uniform. It is an object to provide a device.
[0007]
[Means for Solving the Problems]
The method of the present invention according to claim 1 conveys longitudinally cross-sectional shape by inserting a core bar into elongated material formed in a predetermined hollow shape, a portion to be bent, stop is positioned between the plurality of the entire inner cross-sectional shape of made from members as the elongated material in the transverse cross section each comprising a movable side jig掴手conform to the outer shape of the fixing-side jig A step of causing the plurality of members constituting each of the movable-side jig and the fixed-side jig to be displaced inward, respectively, so that the elongate material is gripped by each of the grips and the cored bar. Holding; rotating the movable-side jig about the longitudinal direction as a central axis, and / or a direction orthogonal to the longitudinal direction, in accordance with a bending process to be performed on a portion to be bent. It is rotated about axis is displaced and / or the direction and / or the said longitudinal direction It is elongated material bending method having a hollow portion which comprises carrying out the; step of rotating is displaced in a direction perpendicular to the direction orthogonal to the longitudinal direction and / or the direction about axis .
[0008]
The apparatus of the present invention described in claim 2, the metal core insertion means and for cross-sectional shape is inserted core metal into an elongated shape material formed in a predetermined hollow shape; transporting said elongated material in the longitudinal direction conveying means for stopping in position is inserted into掴手insertion further movable jig掴手the stationary jig, the portions to be bent become between掴手of the two jig by And by displacing each of a plurality of members constituting the two grippers inwardly, the inner shape of the cross-section of which generally conforms to the outer shape of the cross-section of the elongated material. Gripping means for gripping the elongate material with a hand and a cored bar; and moving the movable jig in a circumferential direction with the longitudinal direction as a central axis, and / or in a direction orthogonal to the longitudinal direction; / or circumferential direction as the center axis of the direction, and / or perpendicular to the longitudinal direction as the longitudinal direction The circumferential direction around axis direction and / or the direction perpendicular to the direction Prefecture, and displacement means to displace in accordance with the bending the bending to be applied to the site to be processed processing; characterized by comprising a This is a device for bending a long material having a hollow portion .
[0009]
[Action]
When the part to be bent is located between the movable jig and the fixed jig, the transport of the long material is stopped, and the long material is gripped by the movable jig and the fixed jig. Be held. Next, the movable-side jig is displaced in accordance with a bending process to be performed on the portion. A force corresponding to the displacement direction and the displacement amount is applied to a portion between the movable jig and the fixed jig, and the portion is bent.
[0010]
【Example】
Hereinafter, examples of the present invention will be described.
FIG. 1 is a schematic view showing the entire configuration of the embodiment apparatus, FIG. 2 is a cross-sectional view of a grip portion 11 of a movable gyro jig 10, and FIG. 3 is for explaining the mechanism and movement of the movable gyro jig 10. FIG. 4 is a view showing the shape of a door frame 5A and its cross section.
[0011]
The apparatus according to the present embodiment includes a stocker loader 55, an automatic metal bar 45, a feed unit 35, a fixed jig 15, a movable gyro jig 10, and a base 25 for supporting these. These are controlled by a controller 20 for control. Further, a robot 90 is installed in a post-process of the present apparatus, and the work after bending, that is, the door frame 5A is pulled out from the jig and removed by the robot 90.
[0012]
In the stocker loader 55, a number of long materials 50 are stored. These are taken out one by one in order, and after the core metal 40 of the device 45 is inserted into the bag portion (hollow portion, see FIG. 2) by the automatic metal core device 45, the feed unit 35 moves to the right in FIG. Then, when the portion to be bent reaches between the movable-side gyro jig 10 and the fixed-side jig 15, it is stopped. The core metal 40 stops moving at the position of the movable gyro jig 10 and does not move further.
[0013]
Next, the long material 50 is gripped by the movable gyro jig 10 and the fixed jig 15. For example, as shown in FIG. 2, the grip portion 11 of the movable gyro jig 10 is composed of five members 11a to 11e, and these members 11a to 11e are substantially arranged so as to be in close contact with each other. The above gripping is performed by being displaced toward the center. The same applies to the fixed-side jig 15. Since the core bar 40 is inserted into the bag portion of the long material 50 as described above, the bag portion is not crushed by the above gripping.
[0014]
Next, the movable gyro jig 10 is displaced in the direction corresponding to the bending process to be performed on the portion by an amount corresponding to the bending process to be performed on the portion, and is necessary to fix the bending process. It is held in that position for a time. The direction of displacement, the amount of displacement, and the holding time are realized by numerically controlling the movement of the movable gyro jig 10 according to a command from the controller 20.
[0015]
More specifically, as shown in FIG. 3, the movable gyro jig 10 is rotated around the X axis (in the direction in which the long material 50 is conveyed) by an angle specified by the controller 20, and Is displaced in the Y-axis direction by a distance specified by the controller 20, and is rotated about the Y-axis by an angle specified by the controller 20, and Z is shifted by a distance specified by the controller 20. This is achieved by displacing in the axial direction and rotating about the Z axis by an angle specified by the controller 20. Note that the X axis, Y axis, and Z axis are mutually orthogonal axes. Further, each rotation angle and each displacement distance specified by the controller 20 are set according to the bending process to be performed on the relevant part and the cross-sectional shape of the relevant part.
[0016]
In this way, when the bending to be performed on the portion is completed, the conveyance of the long material 50 is resumed, and the next portion to be bent of the long material 50 is fixed to the movable gyro jig 10. When reaching the side jig 15, the conveyance is stopped again, and the bending process is performed on the portion in the same manner as described above.
When all the bending operations to be performed on the long material 50 are completed, the long material 50 is pulled out and removed by the robot 90, and the next long material 50 is bent in the same manner as described above. Is performed.
[0017]
【The invention's effect】
As described above, in the present invention, the hollow long material is conveyed / stopped, and the movable jig is displaced at the time of stopping to apply force to a portion sandwiched between the fixed jig and the movable jig. Bending is performed. That is, the bending process is performed without applying tension to the long material. Therefore, there is no problem that the width of the bent portion is smaller than that of the unbent portion. Therefore, the processing of the corresponding member such as the vehicle body can also be performed without considering the above-described slenderness.
Also, in order to grip the elongate material, with a core bar inserted into the hollow of the elongate material and a gripper whose inner shape of the cross section matches the outer shape of the cross section of the elongate material, It is possible to prevent the hollow portion of the long material from being crushed.
[0018]
In addition, as long as there is an area necessary to transport the long material as described above, the present apparatus can be installed, and the installation floor area is small enough.
In addition, a controller is used to specify the direction and amount of displacement of the movable jig in accordance with the cross-sectional shape of the long material and the bending process to be performed on the relevant portion, thereby performing the desired shape bending process. Therefore, it can be easily changed according to the type of the door frame or the like as the target product , or according to the model change of the target product or the like .
Further, since a mold is not required, the cost can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of an embodiment apparatus.
FIG. 2 is a cross-sectional view of a grip portion 11 of the movable gyro jig 10;
FIG. 3 is a perspective view for explaining the mechanism and movement of the movable gyro jig 10;
FIG. 4 is an explanatory diagram showing a shape of a door frame and a cross section thereof.
FIG. 5 is an explanatory view of a conventional apparatus for performing bending.
FIG. 6 is an enlarged view of a bent portion of a door frame processed by a conventional method.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 movable gyro jig 11 gripper portion of movable gyro jig 15 fixed jig 20 controller 25 base 35 feed unit 40 cored bar 45 cored bar device 50 long material 55 stocker loader −
90 Robot

Claims (2)

The cross-sectional shape is inserted into a long material molded into a predetermined hollow shape, the core metal is transported in the longitudinal direction, and the part to be bent is formed of a plurality of members, and the inner shape of the cross-section is formed. step of stopping by whole is positioned between the elongated each comprising a movable side jig掴手conform to the outer shape of the transverse cross section of the material and the fixed jig,
A step of gripping the elongated material with each of the grips and the core metal by displacing a plurality of members constituting the grips of the movable jig and the fixed jig inwardly, respectively; ,
The bending depending on subject to bending to be applied to the site processing of the processing, the movable jig, thereby rotating the longitudinal direction central axis, and / or is displaced in a direction perpendicular to the longitudinal direction and And / or rotating about the direction as a central axis, and / or displacing in the direction perpendicular to the longitudinal direction and a direction perpendicular to the longitudinal direction and / or rotating about the direction as a central axis,
A method of bending a long material having a hollow portion . Core metal insertion means for inserting a metal core into a long material whose cross-sectional shape is formed into a predetermined hollow shape,
The long material is conveyed in the longitudinal direction and inserted into the grip of the fixed jig, and further inserted into the grip of the movable jig, and the portion to be bent is formed by the two jigs. Transport means for stopping at a position between grips ,
By displacing each of the plurality of members constituting the two grips inwardly, the inner shape of the cross section of which generally conforms to the outer shape of the cross section of the elongated material, the two grips are formed. Gripping means for gripping the elongated material with a cored bar,
The movable side jig may have a circumferential direction with the longitudinal direction as a central axis, and / or a direction orthogonal to the longitudinal direction and / or a circumferential direction with the direction as the central axis, and / or the longitudinal direction. Displacement means for displacing in a direction orthogonal to the direction orthogonal to the longitudinal direction and / or in a circumferential direction with the direction as a central axis in accordance with a bending process to be performed on a portion to be bent .
An apparatus for bending a long material having a hollow portion, comprising:

Images